14 research outputs found
Calculation of the similarity rate between images based on the local minima present Therein
Hourany, K., Benmeddour, F., Moulin, E., Assaad, J. and Zaatar, Y. Calculation of the similarity rate between images based on the local minima present therein. 2016. Lebanese Science Journal, 17(2): 177-192.
Image processing is a very vast field that includes both IT and applied mathematics. It is a discipline that studies the improvement and transformations of digital images hence permitting the improvement of the quality of these images and the extraction of information. The comparison of digital images is a paramount issue that has been discussed in several researches because of its various applications especially in the field of control and surveillance such as the Structural Health Monitoring using acoustic waves. The IT support of the images serves especially for comparing them notably in distinguishing differences between these images and quantifying them automatically. In this study we will present an algorithm, allowing us to calculate the similarity rate between images based on the local minima present therein. This algorithm is divided into two main parts. In the first part we will explain how to extract the local minima from an image and in the second part we will show how to calculate the similarity rate between two images
Modelling the energy consumption of memory equipped wireless sensor nodes for healthcare
International audienc
Characterisation and ellipsometric investigation of high quality ZnO and ZnO(Ga2O3)thin alloys by reactive electron-beam co-evaporation technique
International audienceHigh-quality ZnO(Ga2O3) thin films have been co-evaporated by reactive electron-beam evaporation in an oxygen environment. The effect of Ga2O3 on the structural and optical properties has been investigated. X-ray diffraction (XRD) measurements have shown that the ZnO(Ga2O3) alloys are c-axis-oriented. The alloy containing 28% of Ga2O3 showed the best crystallinity. Photoluminescence on ZnO(28%Ga2O3) reveals an enhancement of the ultraviolet near band edge emission at 380 nm while the intensity of the deep-level emissions weakens. A reduction of the oxygen vacancies as well as the reduction of the zinc interstitials with gallium may explain this effect. Thus, the possibility of transitions of electron in the conduction band to a deep acceptor level due to zinc interstitials may decrease. Finally, ellipsometric measurements show that the optimum weight concentration of gallium oxide in the alloys is 28%, thus correlating with the XRD and photoluminescence measurement
Mid-IR photothermal beam deflection technique for fast measurement of thermal diffusivity and highly sensitive subsurface imaging
Hyper frequency modeling of resonated systems based on piezoelectric LiTaO3 thin layers
International audienc
Cobalt-supported alumina as catalytic film prepared by electrophoretic deposition for hydrogen release applications
International audienc
Characterization and Raman investigations on high-quality ZnO thin films fabricated by reactive electron beam evaporation technique
International audienceHigh-quality zinc oxide thin films have been evaporated by reactive e-beam in an oxygen environment. Photoluminescence (PL) on ZnO evaporated at 300°C reveals an enhancement of the ultraviolet near band edge emission at 3.28eV and shows the smallest full-width at half-maximum of the NBE peak about 150meV, proving that the optimum growth temperature is 300°C. X-ray diffraction measurements have shown that ZnO films are highly c-axis-oriented and that the linewidth of the (0 0 2) peak is sensitive to the variation of substrate temperature. The best crystallinity occurred at 300°C, correlating with the PL measurements. The optical transmittance is the highest at 300°C and has been increased after annealing in air, showing an improvement of the optical quality. Raman spectroscopy has been found to be an efficient tool to evaluate the residual stress in the as-grown ZnO films from the position of the E2 (high) mode. On the other hand, the vanishing of the 574 cm-1 Raman feature after annealing has been explained as due to an increase of grain size and the reduction of O vacancy and Zn interstitial. A model has been developed in this work to determinate the normal mode frequencies from Fourier analysis by considering the five force constants starting from the five elastic constants of the material. The vibrational modes at about 100, 435 and 1123 cm-1 have been found from the model for a ZnO thickness of 0.3 μm